Influence of the interteeth clearances on the flow ripple in a gerotor pump for engine lubrication

Gamez-Montero, Pedro Javier; Castilla, R.; Campo, David del; Ertürk, Nihal; Raush, Gustavo; Codina, Esteve

doi:10.1177/0954407011431545

Cited by 30 publications

(28 citation statements)

References 17 publications

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“…Here, Gamez-Montero et al [135] presented a new boundary condition of a virtual wall that allowed simulation of the teeth contact in the interteeth radial clearance. This boundary condition was programmed on a home-made ad-hoc code inside the commercial software ANSYS FLUENT ® .…”

Section: Fluid-dynamic Methodsmentioning

confidence: 99%

A Review of Gerotor Technology in Hydraulic Machines

2019

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Over the years, numerous investigations have established the gerotor fundamentals. This work aims to provide a complete review of the literature from the last decade, focusing on the articles published in the past five years on gerotor technology in hydraulic machines. The report gives a catalogue of guidelines based on the trochoidal-envelope definition, a background analysis, the worldwide distribution of articles in each continent and country and the most frequently used keywords in the field. The paper identifies state-of-the-art research, and reports on current mainstream ideas. From the historical background, this literature review reports the current approaches in gerotor pumps (geometry and performance approaches, modeling and numerical simulations), orbital motors and new concepts. The report will serve as a guide and a directory for novel engineers working with gerotor technology in hydraulic machines. Another intention of this paper is to disseminate the works of the researchers who use this technology around the world, and to provide a scenario for future international collaboration. The paper gives an account of the disparity between academia and engineering applications. There is currently very little published literature on design and production methodologies for gerotor pumps and orbital motors. Hence, the future goal is to collect recommendations that combine academia and industry expertise to make better use of these extensive studies in the field.

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Section: Fluid-dynamic Methodsmentioning

confidence: 99%

A Review of Gerotor Technology in Hydraulic Machines

2019

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“…For the simulation of the contact point between gears, a strategy similar to that employed by Gamez-Montero et al [18] in a gerotor pump has been followed. The contact point has been modeled by imposing that, in every instant, the dynamic viscosity of the fluid is several thousand times higher than the real one only in a small region centered in the theoretical position of the contact point, which is just the center of this clearance.…”

Section: Numerical Modeling Of An External Gear Pumpmentioning

confidence: 99%

Numerical Analysis of External Gear Pumps Including Cavitation

Campo

Castilla

Raush

et al. 2012

Journal of Fluids Engineering

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Hydraulic machines are faced with increasingly severe performance requirements. The need to design smaller and more powerful machines rotating at higher speeds in order to provide increasing efficiencies has to face a major limitation: cavitation. The problem is inherently three-dimensional, due to the axial clearances, the relief and circumferential grooves, and to the circular pipes through which the fluid enters and exits the pump. A simplified two-dimensional numerical approach by means of computational fluid dynamics (CFD) has been developed for studying the effect of cavitation in the volumetric efficiency of external gear pumps. The assumptions employed prevent from predicting realistic values of the volumetric efficiency, but show to be valid to understand the complex flow patterns that take place inside the pump and to study the influence of cavitation on volumetric efficiency. A method for simulating the contact between solid boundaries by imposing changes in viscosity has been developed. Experiments of unsteady cavitation in water and oil performed by other authors have been numerically reproduced using different cavitation models in order to select the most appropriate one and to adjust its parameters. The influence of the rotational speed of the pump has been analyzed. Cavitation in the suction chamber very effectively damps the water hammer associated to the sudden change of the contact point position at the end of the gearing cycle. At high rotational speeds, the volume of air becomes more stable, reducing the flow irregularity. When cavitation takes place at the meshing region downstream from the contact point, the volume of air that appears acts as a virtual second contact point, increasing the volumetric efficiency of the pump.

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“…In the CFD simulation, the gear contact points of the model are indeed important. A leakage model based on a strategy developed by Gamez et al [29] and named viscous wall cell is adopted to simulate teeth contact, i.e. the solid-solid contact point between trochoidal gears.…”

Section: Cfd Simulation: Description and Detailsmentioning

confidence: 99%

“…By means of a high-order Quadratic Upstream Interpolation for Convective Kinematic (QUICK) scheme, the spatial discretization of the momentum equations was applied. More details can be found in Gamez-Montero et al [29].…”

Section: Cfd Simulation: Description and Detailsmentioning

confidence: 99%

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Experimental study on the impulsion port of a trochoidal wheeled pump

Raush

Gamez-Montero

Castilla

et al. 2017

Flow Measurement and Instrumentation

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© 2017. This version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/All positive displacement pumps produce a pulsating flow. The present paper reports the experimental measurement of steady flow pulsations in the outlet of the internal wheeled pump. In the measured flow, the manufacturing tolerance are responsible of part of the spectra of the whole pulsation. Time-Resolved Particle Image Velocimetry technique has been used for this purpose. The flow pulsation measurement from a direct visualization of the velocity profile was carried out. The flow rate signal is derived from ad-hoc integration algorithm of the radial velocity profile, where the area discretization is a constant parameter that is relevant to minimize PIV errors by velocity gradients regions near the wall. Spectrographic analysis on the experimental data reveled low frequency components related with manufacturing tolerances. Measurements of this non-invasive procedure are compared with detailed CFD numerical results obtained from an improved gerotor model where manufacturing tolerances have been included. To be compared, cross-power spectral density analysis has been applied. The results reported in the paper show a method to provide a fast non-invasive flow pulsation measurement not only for pumps but also could be extended to compare aging effects of other kind of fluid power devices.Peer ReviewedPostprint (author's final draft

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Influence of the interteeth clearances on the flow ripple in a gerotor pump for engine lubrication

Cited by 30 publications

References 17 publications

A Review of Gerotor Technology in Hydraulic Machines

A Review of Gerotor Technology in Hydraulic Machines

Numerical Analysis of External Gear Pumps Including Cavitation

Experimental study on the impulsion port of a trochoidal wheeled pump

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